Thanks for writing to H.C.M.
I read your query regarding nose bleeding, though it happens after peeling of nasal crust. As you said that you were having cyst
and for that scrap cytology was done about one and half year back.
You are now having some confussion regarding relationship between nose bleed and menstrual cycle, for this I would like to tell you there is a harmonal cause of nose bleed , though very rare and seen in few girls where nose bleeding occurs with every menstrual cycle this is called as vicarius menstrual cycle.
In your case most probably this bleeding is from little's area of nose and to treat it I will suggest you to consult your ENT doctor. There are coservative and supportive methods like cautrization of bleeding points depending on the case.